Your exercise could be the difference. I'd wager that your physiology and brain are both healthier than theirs, in addition to muscles, bones, etc. The more they get sucked into their electronic world and neglect movement, the more passive they will become.
At my age (56) I see those around my age getting worn down and tired from illness, chronic pain, loss of strength and capacity, fatigue, and stress. Without an exercise routine (or better yet -- training program), they have no resistance to it. And life will beat you down -- demands from job, family, finances, and society. You have to actively build yourself, and then bounce forward from adversity and keep working to be resilient against it, or you just run out of resources to fight. Humor and fun have nothing to subsist on.