Time to replace shocks?

Mine are circa 1979, and still hanging in there.
You will know when they are done, when you cross a set of diagonal train tracks, and all heck breaks loose.
If you have to ask, then they are fine!
In the old days we would just grab a corner and lift it as hi as we could and then drop it. If it bounced more than twice, the shocks were on the hit list. But if you try that on today's cars the fender will come off or wrinkle right up.lol.