I'm old enough to be grandad to at least half of the people here and trust me, age has nothing to do with the love of fishkeeping.
Fish don't return the love and affection the way the family dog does, but you do get attached to them never the less. You are taking on a big responsibility when you commit to keeping fish. My office tank ( a mere 50L) has one Betta (Basil - don't ask, I didn't name him) that appears to enjoy the company of his tankmates - half a dozen WCM, seven Cory and a lonely ADF (two died of old age). I can't help but smile as they follow me from one end of the tank to the other when I walk past and it is relaxing to watch them. At least I don't have to take them for a walk in all weathers.
I can't say I actually enjoy the work involved in keeping on top of tank maintenance, especially as I could have weeks where I am only in the office for one day and squeezing all the work into a lunch hour is a challenge. Thank goodness for the F14 auto-feeder and Seachem products like Prime.
Ken