Is there any chance that the HDD breaks?Such a possibility is always there
, regardless of the age of the drive and its type. New break no less than the old one.
Generally the average lifespan of a HDD is about 5 years. Depending on the load and good luck it can be more or less.
Is it dangerous to use such a drive?Or nothing?No more dangerous than new
if SMART normal. The only question is performance.
I'm afraid that will break after a time working with the data.There is a very high probability that it will happen.
And there is no difference a new drive or the old one.
If the data is valuable - make backups.
If you do not want a break in the work - place RAID.
Often need both.