Should you offer help???

The other day, I waited long for the bus after an amazing game of tennis with my friend. I waited for long and finally after 15 minutes, there it was....zoom comes the bus and stops just ahead of us. I had really enjoyed my game that day and was excited. I went in and sat down at the back of the bus, and an "old" man came and stood in front of me. As an act of courtesy, I offered him my seat, but to my surprise, the man got offended. I was shocked. He said, "He looks old, but is not old enough, but thanks anyways" and then went on grumbling our generation. I wanted to give it back to him, but I kept quiet.

Later the seat next to me got empty and he sat down. I thought why does he want to sit now? He is not that old, rite? After few awkward moments, I spoke to him. I told him that I did not mean to offend him. He said he knew it but it was just his ego, due to which he reacted that way he did. He was a manager at the wine store, lifting big wine boxes each day, and got offended when I offered him a seat, because he was still fit and fine. He was 58 years old, but young. He later said, that it was good on my part, it showed my upbringing, and said that today's youth who would never offer a seat like that. Now I am not sure about this, but this is what he said.

We ended up speaking about tennis, as he saw me speaking to my friend who had our racquets. He was a good baseball player, a man who watches BBC news (rare to find here, but true) and who wants to learn how to play cricket, as he got to know about it from BBC. He said he was good with at baseball, and could be a good batsman in Cricket, which I think he might be too.

So what was it, that offended him to that extent? He was a kind man, good to strike a conversation with, but what offended him so much? I have no clue, but I know one thing for sure, never make assumptions looking at a person. Maybe you might do something like what I did.