I guess FedEx is a rightly a "legacy" freight airline.
Judging by the guy who posted this data, who I'm pretty sure is a FedEx pilot who also runs a very well respected pilot interview prep company (Emerald Coast Consulting ?), I say this is likely good data as of mid 2015. They aren't losing as many compared to the Big Three pax legacies so I'd expect the competition to be stiff.
They have ~ 4,300 pilots.
Here are the FedEx (potential) retirement numbers…pilots turning 65. Some may leave early for any number of reasons:
2014: 69
2015: 110
2016: 114
2017: 163
2018: 177
2019: 144
2020: 178
2021: 206
2022: 211
2023: 222
2024: 229
2025: 218
2026: 241
2027: 209
2028: 203
2029: 186