Why are characters like 来 & 果 sometimes written with the vertical stroke ending in a hook?
And I noticed this is more often done by older people.

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只有在”毛笔书法“中，才会出现这种情况哦。“果”和“来”，在写完 "|" 以后，要往左，写“丿”，所以会很自然连贯地写出勾。
That's stroke connection in Chinese calligraphy.
Other examples like "林“，”木“，”禾“，“束”，“棘'. (the leftfalling stroke is immediately after the vertical stroke)
但是，大多数情况下，汉字都是讲究”横平竖直“的。We want the horizontal and vertical strokes to be totally straight.

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just for beauty -- no real meaning

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I don't think that is the correct way to write both of these characters. I have never seen people write 来 & 果 with the vertical stroke ending with a hook.