Christine it would be useful.
I'm working on early Ontario, and look at the dates that are hopefully on the profile, to decide who to work on, and then go to BMDs and censuses, 1851, 1861, there are enough sources.
I look for a death or burial record, which provides an approximate birth date from age at death, then go to the census records. There are marriage records for some but not all pre 1840.
Some other sources are parish records that sometimes can be found on historical society websites.