Why was Nestor considered old?

Nestor and his palace at Pylos constitute problems. Nobody really knows where these names originate from and what these names could possibly mean.

[Nestor]

One of Nestor’s prime characteristics in the epic poems is his age, writes Jonas Grethlein[1]. Nestor has even become synonymous with ‘old man’. But how old was Nestor? There are two passages in the Iliad and the Odyssey which explicitly state his age.

In Iliad, Book I, lines 250- 252 the Homeric narrator says:

δύο μὲν γενεαὶ μερόπων ἀνθρώπων ἐφθίαθ᾽, οἵ οἱ πρόσθεν ἅμα τράφεν ἠδ᾽ ἐγένοντο ἐν Πύλῳ ἠγαθέῃ, μετὰ δὲ τριτάτοισιν ἄνασσεν:

“Two generations of mortal men had passed away in his lifetime, who had been born and reared with him before in sacred Pylos, and he was king among the third.”

Telemachus explains his respect for Nestor in Odyssey, Book III, line 245

τρὶς γὰρ δή μίν φασιν ἀνάξασθαι γένε᾽ ἀνδρῶν: ὥς τέ μοι ἀθάνατος ἰνδάλλεται εἰσοράασθαι.

...for thrice, men say, has he been king for a generation of men, and like unto an immortal he seems to me to look upon.

Whatever you make of these statements, they certainly give the impression that Homer meant to convey the image that Nestor was old, possibly very old.

Though life was generally short (or cut short) in the distant past, some people could reach a very high age. Seneca the Elder was over 90 years old when he died. So, why was Homer so explicitly mentioning the advanced age of Nestor?

Maybe everybody has been looking in the wrong direction. Maybe we should turn our attention southwards. Towards Egypt.

In Ancient Egyptian, pr or pr`Ȝ meant 'great house' or 'palace'. Martin Bernal suggests that the Egyptian word may be the origin of Pylos (Πύλος), which has been inhabited since Neolithic times[2]. So, it's old, very old.

This idea is less strange than it may seem at first glance because in one of the oldest Greek scripts, Linear B, the site is called pu-ro[3].

[Dagger, found in Pylos, made from Damascene bronze. It depicts creatures of the sea]

Could the palace of Nestor possibly have been founded by Egyptians as a small colony, then deserted, and finally been inhabited by Nestor's ancestors? Or was Nestor himself descended from Egyptians?

The name Nestor, ruler of Pylos, itself may also point to an Egyptian origin because it has a plausible Egyptian etymology in either Hst Ḥr 'royal throne' or Nst wr 'great throne', both of which titles are attested.

That the word Nestor referred to a title rather than a personal name of an individual would explain Nestor's longevity, which so amazed Homer.

[1] Grethlein: How old was Nestor? in Eikasmos - 2006. See here.
[2] Martin Bernal: Black Athena: Volume III: The Linguistic Evidence - 2006
[3] Barbara Montecchi: Pu-ro, pa-ki-ja-na/ne, and the Sanctuary of Poseidon at Pylos in Aegeus Society For Aegean Prehistory - 2018