>>11033838When I got back into Lego last year, at the age of 32, it started when I saw pic related at the grocery store, and I figured it'd be something I could have on my shelf without feeling too weird if anyone saw it. When I went to pay, the cashier (who I'd guess was in his early 20s) offhandedly mentioned that he also owned that kit, and that he'd built it together with his girlfriend as a date.
So, I suggest maybe starting with a "decorative" kit or two to get used to Lego again. Hell, I've even brought a few of the botanical kits with me to work, to decorate the office, and I've only ever had positive responses from my co-workers.