Now decide which of the following sentences are correct from a tense perspective:

1. My grandfather was a carpenter until the day he died.
2. My grandfather had been a carpenter for 55 years by the time he died.
3. Having been a carpenter his entire adult life, my grandfather died in a house he had built himself.
4. In the triathlon, I swam 2.4 miles, biked 112 miles, and then ran a full marathon.
5. In the triathlon, I had already swum 2.4 miles and biked 112 miles before I even started the full marathon.

I believe 3 and 4 are incorrect.
How does being carpenter results in death in own house?
I believe then violated the rule of parallelism in sentence 4.
Can experts explain?