Rather than drift this thread. Some people were surprised at OP going that long on a single Glock.
What's the oldest gun you bought new or close to new with the intention of using/carrying it and you still have/use it? How long was (is?) it in active use? Not "I have a 1911 from 1911 I shot 10 rounds through" or grandpa's .45 that never got a lot of use because it was already too sentimental/valuable to use.
In a similar position to OP with his 1998 Glock. I have a pair of 686s from 1995 and 2000 that I (mostly) stopped the clock on around 20k awhile back. Shot/competed with/carried a fair bit over the course of a couple decades. One of them still gets shot occasionally. Both of them acquired same year they were made with entirely practical intentions. (One new, one "used" by a buddy for about a weekend.) I can think of at least a couple shooting buddies in similar-ish situations. Lots of churn overall. New stuff comes in, some older stuff goes out. But there's been a few pistols that stuck around for the duration and either still get light use or eventually just accrued too much value/sentimentality to risk continued shooting/carrying.
Doesn't have to necessarily be high round count if it's a carry piece not suited to that sort of thing. I just swapped the dead night sight on my 2014 Glock 42 and that one only has a few hundred rounds on it but next year will be a decade. Fresh night sights should carry it through another 10 years. I doubt the total round count will ever exceed a thousand.