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My MacBook Pro is mid 2009, should I start thinking about a new computer?
IMO, yes.
The 2009 MBP is considered "vintage" by Apple and the Max OS is 10.11.6, so there will be no more OS upgrades. There will be no more software and hardware support for it from Apple.

You could stay with the 2009 if it does what you need, but I think it is getting to be time to look for a replacement.
 
I think the biggest gamble in keeping that machine would be the hard drive. It's been clocking up hours and start/stop cycles for 7 years now, and rotating drives always fail eventually. It might be tomorrow or 10 years from now, but the odds aren't going to get any better. At the very least, if you decide that there isn't anything available that suits your needs at your price, consider replacing the hard disk with an SSD.

I don't think you need to rush into anything, but I agree that it's probably time to start planning for a new computer.
 
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