New Stove Time?

Our kitchen stove is old. We bought it as a replacement for the crappy stove that was in the house when we moved here in 1997. We got this stove several years later probably around 2001 or 2002. I know our current stove is over 20 years old. So why is it probably time for a new stove? First of all we have started smelling a faint trace of gas when the oven is lit. The smell only last a minute or so but it is enough to cause concern and means that maybe when we light the stove there is a puff a gas released before it is lit. The oven does light right away and stays lit. 

One of the burners has needed to be lit by hand for several years now. We have a lighter handy in the adjacent drawer to fire up that one burner. The others work fine. There are some rust spots on various parts of the stove. It is time to get a new stove.

We also have been wanting to replace the hood over the stove for some time. The light doesn't work and the fan is erratic. We have had to set up a desk lamp next to the stove to provide enough light to see what's cooking on the stove. So when we replace the stove we will also replace the hood light and fan.