I just started cycling in August and using Strava in January. So, to answer the OP's question, you're not the only grandfather using Strava, but I do not obsess about it....yet.
I do think it is a good motivating tool and great way to keep track of your rides and improvements. I already have 2 KOM's and many top 10's. Most of our segments are climbs, which are easy for me. The steeper and longer they are, the higher on the segment list I am, still not obsessed about it but fear it is eminent, LOL