I had an online exchange with a friend recently about her MacBook Pro, which is a 2011 model with an i7 processor, 16 gigabytes of RAM and a fast solid-state drive.

It has been a really good machine for a decade. I should know, because I sold it to her a few years back, and it was my personal laptop.

She wanted to upgrade Microsoft Word, but that couldn’t happen until she upgraded the Mac OS to the current version.

The only problem is that Apple stopped supporting the current Mac OS on laptops older than 2013.

She was also having issues with the battery, which refused to charge, so she had to keep it plugged in all the time.

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She was hoping there was a way around the operating system issue (there isn’t), and wondered whether it was worth it to replace the battery (probably not).

I told her she can keep using the MacBook Pro as it is, with the older versions of the Mac operating system and Microsoft Word, but she (wisely) decided it was time to invest in a newer laptop.

A replacement battery would cost $90, which is a lot for a computer that’s 10 years old.

She wasn’t ready to shell out the cash for a new 16-inch MacBook Pro, but she really didn’t want a 13-inch screen, which is the only other choice for Mac laptops. She liked the 15-inch size, so she asked where she might find a reliable used one.

Apple has a refurbished store on its website, but there were no 15-inch models to be found, and the cheapest refurbished 16-inch model was just over $2,000.

I pointed her to Gazelle.com, which is a buyer and seller of used phones, tablets and laptops.

She found a 2018 15-inch MacBook Pro for around $1,650, which should be a viable laptop for at least the next five years.

I don’t want this to be a commercial for Gazelle — there are other places to buy used laptops.

You can try OWC (macsales.com), Mac Of All Trades (macofalltrades.com) or Best Buy (bestbuy.com).

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