fogey
A dull person (especially an old man) who is behind the times, holding antiquated, over-conservative views.
[T]he old fogies, as you call them, at Bays’s, are some of the first gentlemen in England, of whom you youngsters had best learn a little manners, and a little breeding, and a little modesty.
Where it comes from
Borrowed from Scots foggie, fogie (noun), perhaps derived from Scots foggie (“covered with moss or lichen; mossy", hence "old, antiquated, decrepit”, adjective), from Scots fog (“moss; lichen”), equivalent to fog (“moss”) + -y. Further origin uncertain. More at fog.
Adapted from the Wiktionary entry fogey (CC BY-SA 4.0).