Old Aluminum Mast -- Replace?

[triton318]

I have a 1962 Pearson Triton with the original mast. In about three years, I plan to sail this boat around the world. Should the age of this mast automatically qualify it to be replaced? Can a 46 year old aluminum mast be as strong as it was when it was new? I understand it would need to be inspected carefully for corrosion and cracks. I guess what I'd really like to know is this: does aluminum lose strength and structural integrity with age? If it doesn't, and an inspection shows no cracks or serious corrosion issues, would the mast be as strong as a newer one? Also, would welding small pieces of a compatible alloy of aluminum over holes help? Thanks.