PES

*ˀbr - to be old (Kogan 2015: 276)

on meaning shift “sturdy, strong” > “old” cf. Buck 1949:959

PS
*ˀbr - to be strong, vigorous (Kogan 2015: 276)

Geez
ˀəber - old woman (CDG 5)
Cf. ˀəberāwi - old man, old woman (CDG 5).
Tigre
ˀabbärä - to be old, to grow old (WTS 366)
Selti
əbēr - grandfather, grandmother (EDG 9)
Wolane
əber - grandfather, grandmother (EDG 9)
Zway
ibīrī - to be old (EDG 9)