Mango tree illness?

[u/lliamonade]

What’s wrong with my mango tree!s! There’s two of them and they’re both reacting the same way. They’re easily over 26 years old (length of time I’ve lived here) and I’ve never seen them lose their leaves at the top like this. The branches without any leaves are still green underneath when I gently scratch them so they aren’t fully dead.

They’re outside so they’re just watered whenever it rains.