Dude this is just trivial superficial garbage. I'd way rather look like Groink in my mid forties than be tied down with a family, or a career. You think you can look that good with a full time job and kids, not a chance. People gotta stop focusing so much on kids and career, that's a poor measure of success.
That sure is not a CAN DO ATTITUDE.
You sound like a young cat. You absolutely can have a very healthy and active lifestyle while having a full time job, kids and being married ( i even know people who have also gone back to school ontop of everything and are in fantastic shape).
Hell, my parents have been running marathons for years and are in the best shape of their lives at 65 and all of their friends are the same way. You just need to surround yourself with healthy and active people.
I am pretty shocked these days by how many healthy and pretty fit 60+ year olds i see. Those baby boomers are sure showing up my generation that is forsure.