How much contact do people realistically keep with old school friends?

[GirouxSein]

I bumped into someone I was very close to at school and it was friendly but slightly awkward. We did the whole “we should meet up sometime” thing and then nothing really came of it.
It got me thinking about how many people actually stay in touch with school friends long term. I’ve drifted from most of mine and sometimes wonder if that’s normal or if I’ve just let things slide too much.

I’m 59 and in touch with 2, I met one of them on the first day of primary school, the other 2 who I was still in contact with both died when we were mid fifties. Until I was 40 I was in touch with a further 2 but kids, careers etc there just wasn’t time. I haven’t lived in my home town for close to 40 years.

I look at SM like MN but have no instagram, FB or any here I am SM.