I have sons with similar age gaps but 20 years on..........yes you'll still be doing them with the addition of any girls that come along 🤣 (although to be fair I'm finding girls things easier 🤷♀️)
Over the years........
Boxers, socks, PJs or lounge pants, chocolate, sweets, shortbread, gingerbread men giant and miniature ones from M & S, those tubs of twiglets, cheddars etc that come out at xmas, toiletries, hair gel, jumpers/sweatshirts, shoes, slippers, special cans of strong craft ale or soft drinks for the ones that don't drink. One of mine always had to have glass bottles of coke in his as doesn't drink alcohol, another likes weird teas, honey, board games, hats, scarves, gloves, popcorn, rubicks cube or other puzzles, notebooks, cocktail making accessories, miniature cocktails, port, whiskey, liquers, sloe gin, soap on a rope were a retro hit one year as they'd never seen them before. One has miniature Xmas puds/xmas cakes/tins of shortbread/special jars marmite as lives abroad and they go home with him.🎅 oh and not forgetting the chocolate coins and thorntons chocolate characters........yes they still want them😩