My tents don't keep for long, I can use one for around 200 nights a year. I've had 4 in the past 10 years, including my current one a Terra Nova Compact 2 I've had since September 2021. Its seen around 30 nights so far and might last long enough that I'll get complacent and start looking at other tents again before its worn out.
Two of my holiday camping / family tents are decades old, and another is almost 10. They don't see any use now, take up space and have possibly started to de-laminate since they've been folded up in their bags a long time. (Might get them out in spring and check them over then possibly give them away if they are still okay). They're not valuable though, cheap Vango and Eurohike models.
My really old "carrying" tents from the 80s are long in the bin, its usually black mold spots that got the better of them, then that moldy smell that won't go away, even using odour eliminator.