https://www.backblaze.com/blog/backblaze-hard-drive-stats-q2... has the best statistics that I know of. Basically a 1% failure rate each year (worse for a few bad batches of disks), so yes I think you have gotten lucky so far. (1 - .99^(25*3)) = 52% chance of at least one failure for three drives over 25 years.

Out of ~30 disks over my ~30 years of hard disks I can count at least 3 5.5" HDD failures and 5 or 6 2.5" HDD failures. Laptop drives seem to fail at a much higher rate especially for kids.