Very valid point. I didn't go abroad until I was 24. My parents never took me abroad for holidays, in fact, we didn't even have UK holidays. In the 70s and 80s I always viewed the TV holiday progs (Wish You Were Here and BBC's Travel Show) as something magical and never thought I'd be able to experience/enjoy foreign travel. It was always something that "someone else" did, not us. Pictures/videos were hard to come by - yes, there were little travel guides and you could borrow bigger books from the library, but it all looked "inaccessible" and that's want gave it a kind of magic about it all.
All that changed when I met DH. He'd already been bitten by the foreign travel bug and had been on foreign holidays with his family a few times. His father had been in the RAF so he'd been born abroad in a RAF base and his father (sometimes with mother, sometimes alone, sometimes with his too as a chold) had lived in various foreign countries (RAF bases). When he left the RAF, his foreign experiences meant he had the "bug" and they started having holidays abroad as soon as it became more widespread and affordable in the 70s! We hadn't been together long and he wanted to go on holiday with me instead of his family (obviously!) and I took the plunge. Never been on a plane before, but he had lots of experience via his family (although he'd never been abroad without them), so we muddled through everything together and had a brilliant first holiday - just the Med but it was a learning experience especially for me). Very quickly, we graduated to the US, Canada, Kenya, Egypt, Israel, Turkey, Gambia, Greece, etc. Within 3 or 4 years, we'd become seasoned/experienced travellers and we were loving it! I was experiencing all the places I'd seen on the TV programmes that I'd regarded as "outside my league". The only limitation we had was a very restricted amount of annual holidays from work. We both lived at home, so we weren't paying stupid rents and other costs (but both paid our "board", and were both working full time in decent jobs, so we had the money. We certainly "filled our boots" for a decade or so, before we finally settled down to marriage, family, buying a house etc. For us, foreign holidays were "our" special time together, all the better for seeing many of the World's top attractions/sights together.
Our DS is completely different, first foreign holiday at 2 years old, then "med" style holidays every year (or two per year) alongside UK holidays. It's just "normal" for him, and he regularly now goes away with various different friend groups for Euro city breaks, beach holidays, short breaks for European football matches or Grand Prix races etc - he thinks nothing about it - just buys a flight and an air BNB just like he's having a UK trip. I've often asked him if he wants to go to the "big" sights like Egypt, Grand Canyon, etc., but he just shrugs "meh" and says he can see them on the internet, pictures, videos and even 3D/immersive experiences, so doesn't see the point in actually going! Maybe if he had a special friend, it'd be more of a "joint experience" but he just doesn't seem bothered.