It depends on whether you assess this by year or by ordinalnumbers.
2
When are ordinalnumbers capitalized?
3
The numbers to which this rule applies are the cardinal and the ordinalnumbers from twenty-one and twenty-first to ninety-nine and ninety-ninth inclusive.
4
Second, the motorised generation has failed to distinguish between ordinalnumbers (by which years are designated) and cardinal numbers (which turn up in car odometers).
5
Ordinalnumbers used to designate numbered political divisions, sessions of Congress, names of regiments, Egyptian dynasties, and the like.