my first known ancestorDirck Cornelis 1505-1571 = 66--------his wife Neeltje ca. 1510 - 1570 = 60
his son Cornelis Dirkxe 1560 -1634 = 74---------------his wife Lijsbeth ca. 1570 - 1624 = 54
his son Leendert 1599 - 1669 = 70---------------his wife Lysbeth ca. 1607 - 1681 = 74
his son Gerrit 1643 - 1681 = 38---------------his wife Jannetje ca.1646 - 1695 = 49
his son Gerrit 1667 - 1720 ? = 54---------------his wife Maartje 1677 - 1720 = 43
his son Gerrit 1705 ? - 1774 = 69---------------his wife Wijntje 1713 - 1760 = 47
his son Gerrit 1736 - 1802 = 66---------------his wife Willemijntje 1752 - 1802 = 50
his son Leendert 1788 - 1859 = 71---------------his wife Pietertje 1798 - 1859 = 61
his son IJsbrand 1834 - 1895 = 61---------------his wife Klazina 1839 - 1915 = 76
his son Pieter 1866 - 1948 = 82 ---------------his wife Jannetje 1875 - 1936 = 61
his son IJsbrand 1908 - 1993 = 85 (my dad) - my mum Leonora 1915 - 2002 = 87
So the man in my (fathers) family has an average 67 and the woman 60.
Looking to my parents and grandparents : My mums father 69 and mother 72
woman : 79,5 man 77
that would give me at least another 18,5 year (else my prospect -60- aint good at all since I am 61.)