Which domain name should I choose? Please share your opinions.

Hello,

I need your opinion. I am going to open an outdoor equipment sale e-commerce company on web.

Should I register a new domain like for example barnellaoutdoor.com?
Or
Should I buy 10-15 years old aged 4-5 chars like barn.com, barne.com or smth like that?

Which would be better for me? 4-5 chars domains are expensive. Is it worth it?

Are older-aged domains better for Google Ads and SEO?

Should I put "OUTDOOR" keyword in the domain name?

I would be very happy if you share your...