My mom formula fed all her nine kids (me in 1976 and 1960, 62, 63, 65, 67, 69, 71, and 79). She told SIL that she thought nursing for maybe three months max would have been nice (SIL was nursing her 11 month old at the time, lol). She has only been supportive of me, though, and my dad, wow I have been impressed how open they are to it (still nursing Dd, though i'm not sure they know that at 3 years and Ds at 4 months).
DH was nursed until 15 months (1975), his brothers 10 months (1972) and 2 years (1980). I sometimes think they are *more* shocked by my continued nursing, though they are also more "in the know" of our nursing.