Hi Sue, ex-dentist here.
You need to ask the dentist how long they think a post would last. It really depends on the length & size of the root. If it’s a long root of reasonable thickness, a post crown will last longer than if the root was shorter or thinner. With a short root, there’s a greater risk of the crown falling out, or the root splitting.
For what it’s worth, I broke my front teeth aged 7, the worst possible age. One was extracted & the space allowed to close.
The other one had a post crown & despite the poor prognosis, it was another 48 years before the root finally fractured and I had an implant done. That was 10 years ago and it’s been fine.
But every case is different and you need to ask as many questions as you can of the dentist you’ve been referred to. A good one is ‘what would you advise if I was your mother?’ Ask how straightforward an implant would be - sometimes you need additional procedures if the bone isn’t good quality or not thick enough.
Hope that helps