One can demand what one likes, and some do. Doesn't mean that the demand will be complied with.
You don't need to show ID either, but there may be consequences.
If the driver can't tell that a 73 year old person is over 18, then he's not shown much initiative. You may well not have photographic evidence; it can't be assumed everyone does. Yes I know there is an argument of a slippery slope, if 73 can avoid ID what about 63, 53, 43, 33, 23, 13... but there are reasonable limits. Probably more than their job's worth.