Don't grow old - in Sardinia !

It was a custom in Sardinia that the children of aged parents beat them to death with clubs and buried them, in the belief that it was wrong for the excessively old to continue living, since the body, suffering through age, had many failings....The Derbiccae kill those who are seventy years of age. They sacrifice the men and strangle the women.

Νόμος ἐστὶ Σαρδῷος, τοὺς ἤδη γεγηρακότας τῶν πατέρων οἱ παῖδες ῥοπάλοις τύπτοντες ἀνῄρουν καὶ ἔθαπτον, αἰσχρὸν ἡγούμενοι τὸν λίαν ὑπέργηρων ὄντα ζῆν ἔτι, ὡς πολλὰ ἁμαρτάνοντος τοῦ σώματος τοῦ διὰ τὸ γῆρας πεπονηκότος.....Δερβίκκαι τοὺς ὑπὲρ ἑβδομήκοντα ἔτη βεβιωκότας ἀποκτείνουσι, τοὺς μὲν ἄνδρας καταθύοντες, ἀπάγχοντες δὲ τὰς γυναῖκας.

Aelian, Varia Historia 4.1 (tr. N.G. Wilson):