Are plumbing issues common in 40 year old homes

[Ben M.]

I am looking at a house built in 1980. There seemed to have been quite a bit of plumbing issues:

1) Piping under the bathroom sink of 3 bathrooms had a leak and pipe replaced

2) Leaks in the walls behind tub faucets due to piping issues  for 2 of the bathrooms

3) Leak that went down all the way to the garage roof from one of the tubs

The owner said the issues have been fixed for a while now. Are these types of plumbing issues common in a 40 year old home? Would you go for a house with these types of issues and how would you approach it?