Travel in your 20s, 30s, 40s, 50s, 60s, because every decade you will have different constraints and experiences. e.g 20s may lack money, 60s may lack health. So don’t wait. It is money well spent.
I found this little gem on an Australian forum I frequent.
It’s easy in your thirties with young children to forgo travel by putting it in the ‘too hard’ basket, but it can still be very rewarding when you actually do.
I imagine the forties will have similar challenges of traveling with teenagers, but I don’t want to get too old to realize I haven’t traveled enough.