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The following 1 minute video will show you the difference new blades will make as compared to old blades. The blades in the video are the exact same blades, only one set is clearly worn out and the others are brand new.
If you're blades aren't cutting the grass as well as they used to or the mower is leaving streaks in the yard, you likely need to replace the blades. Mower blades should be in good condition in order to cut the grass properly. Dull mower blades really don't "cut" the grass; instead they rip and tear it, which damages the grass. This will leave your lawn vulnerable to insects and disease and heat stress.
So, how do you know when to change the blades? How often should you change your mower blades? It depends on how often you're cutting the grass and what type of grass you're cutting and so forth. The best know when to change your blades is to look at the blades and see what condition they are in.
If the leading edge is rounded or there are some dents, tears, chips, or folded back edges, you need to replace your blades. By not replacing the blades the lawn mower has to work harder, using more fuel and putting more wear on the mower than necessary. The money spent on a new set of blades is a small price to pay for a healthy lawn and a healthy mower.