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WAG: did you celebrate getting twice as old?
Is this somethings all people do? Most people do? Many people do? Do the people who do this typically do it less often with age? If so, do they have to? Does it take seconds to do? Minutes? Hours? Days? Weeks? Months? Years? does it take longer to do when you're older? Is it harder to do when you're older? More expensive? Less interesting? Does it cost anything? Does it require other people? Some object? Animal?

Is it a leisure activity? Can you do it in a lot of cities? Is it done outdoors? inside? Can you do it on your own? Do you need other people to do it? Did you like doing it when you were younger? Was something keeping you from doing it in the subsequent years? Was someone keeping you from doing it?

GalFisk
WAG: did you celebrate getting twice as old? Haha, good guess, but no.
Is this somethings all people do? Most people do? Many people do? Hard to say. Certainly many people do it, but might perhaps not pay so much attention to it. Do the people who do this typically do it less often with age? Possibly, hard to say again. If so, do they have to? Possibly. Does it take seconds to do? Minutes? Hours? The activity itself might be done within a few minutes or hours .. Days? Weeks? Months? .. but usually requires preparation of days to months. Years? does it take longer to do when you're older? Not necessarily. Is it harder to do when you're older? Yes. More expensive? Potentially, yes. Less interesting? No. Does it cost anything? Yes. Does it require other people? Some object? Animal? No to the rest.

MotherGothel
Is it a leisure activity? Not per se, but it can be done in the course of leisure activities. Can you do it in a lot of cities? Yes. Is it done outdoors? Yes. inside? No. Can you do it on your own? Yes. Do you need other people to do it? No. Did you like doing it when you were younger? Yes. Was something keeping you from doing it in the subsequent years? The usual time and budget constraints. Was someone keeping you from doing it? Would never dare to say so.

Can you do it outside of cities? In another country? does it involve travel? Is it costlier when you're an adult? Is it fun? Dangerous? Is gambling involved? Is it a hobby? Is it something you get worse at when not doing it often? When you were young and did it several times a year, were you a child? Teen? Adult? Do you do it alone? with one other? A few others? Lots of others? Art involved? Sports? Animals involved?

GalFisk
Can you do it outside of cities? Yes. In another country? Yes. does it involve travel? Yes. Is it costlier when you're an adult? In most cases it becomes costlier with time. Is it fun? Mostly. Dangerous? Could be in some cases. Is gambling involved? No. Is it a hobby? Could be a hobby. Is it something you get worse at when not doing it often? No. I would not say so. When you were young and did it several times a year, were you a child? Teen? Adult? Teen or twen. Do you do it alone? with one other? A few others? Lots of others? All of that has happened. Art involved? Sports? Animals involved? No to all.

WAG: does it involve going somewhere you haven't been before? Which gets costlier as you've been to most nearby places before? Is method of travel relevant? Distance? Time spent traveling? Time spent at the destination?

If it involves a specific form of travel, is it plane? Train? Automobile? Boat? Catapult?

Does this only work with international travel? Domestic?

Is it something you do while you are actually making the journey? Something you do in between arriving and going back home?

Is a hotel involved? Other place of accommodation? Car rental? Figuring out train or bus schedules? Getting directions? Adjusting time zones?

Can it be done in cities too? Does doing it (*childish snicker*) require another person?

I think this is close enough for a ...

SPOILER
The activity is travelling to a country where I've never been before. Naturally, when you're young and start to travel abroad, you will come to a new country all and often. Then, the more countries you've already visited, the harder it becomes to come across a place where you not had been yet. For me, the trips to new countries came to a pause in 2009 after a vacation in Malta. Until last October when I was in Feldkirch, Austria, and decided to take a visit to neighbouring Liechtenstein. (20 minutes walk)

Congratulations to GalFisk and trebor for the solve.