Car tire - do i need to get it changed-?

Hi
i was told that all 4 tires in my 2004 ford car needs to be replaced.
i bought this car in 2013 when it had 115k in it and now reaching 150k.
but i want to be sure if it really needs one before i invest on it.
also., buying tires online a better option./
if not, where to get quality tires with a reasonable price.

No you drive it until the tires falls off. Of course you need to change the tires out once it get worn down.

ON LINE? Where would you get them put on,… And Warranty protected? Just go to a Tire Store and pay the price… There's many to chose from,… I prefer the Individual tire store Over the big chain groups

Shipping is a killer for online purchase of tires. The tire size will be molded into the side of your existing tires. Get on the internets and search for local tire places. Call each of them and ask how much 4 tires of your particular size would be and how much to install them and how much to dispose of the existing tires.

Don't mention the make and model. But if one worn then its a safe bet the rest do to. If you buy online you need to have correct tire size for your car. Then find a shop willing to install them of course if a tire goes during the warranty they give you another tire and the shop recharges labor since you supplied the tire. The other problem is if the tire goes bad you bought online goes bad you have to prove you kept up on tire at correct air pressure, along with keeping up on alignment and the shop installed it correctly. So call several tire shops to get estimates to replace all tires

The tyres are either worn out or not - no grey area there
No one here can see where in the world you are so giving tyre buying advice to you is pointless.

If the tire has less than 2/32" of tread, you can actually be cited for bald tires. Most tires start with about 10/32" tread when new.
Based on the numbers you state, you have put around 35K miles on the tires. Low priced tires may be rated for 40K miles. Higher end tires may be rated for 100K miles. Without actually seeing the tires, we can't tell if they need replaced. My GUESS would be they are at, or near, the end of their useful life.

Joe's tires is the place to go.