10 years old Die hard Gold

My next door neighbor sells batteries for lawn mower,cars,tractors, trucks ,etc, he is a distributor,i was complaining about batteries in my mower lasting about 2 years and then having to jump start them,and replacing them every 3 years, he said in a lead acid battery when i got it new to put an aspirin in 1 of the cells and it battery life would be extended, so 8 years ago ,i paid $24 for a battery ,put in the aspirin and after i junked the craftsman i had it in, i moved it over to my cub, and it starts every spring without charge and sitting all winter, my neighbor who told me that said he was on 12 years on his mower battery, so i am curious to see how long mine last, but as for now started last week and i got the leaves from my oaks mulched up .