We cannot use very with comparatives. Instead we use other degree modifiers like much, far, very much, a lot, lots, any, no, rather, a little, a bit and even. She is much older than her husband. (NOT … very older than …) Is he any better? Russian is much/far more difficult than Spanish. You are…
We use the superlative to compare somebody/something with the whole group that she/he/it belongs to. Tom is the tallest of the four brothers. Gold is the most precious of all metals. (OR Gold is the most precious metal.)
To say that people, things etc are unequal in a particular way, we can use comparative adjectives/adverbs. She is older than me. Tom is taller than his brothers. Iron is more useful than any other metal. He is cleverer than her.
Positive adjectives and adverbs can be used for comparing. Several different grammatical structures are possible. As … as …
English adjectives and adverbs commonly distinguish three degrees: the positive (the basic form), the comparative (expressing a higher degree than is present in something else) and the superlative (expressing a maximal degree). Comparative and superlative adjectives: formation