Dwarf

Dwarves are not necessarily short and stumpy with big beards, but can be short, lean, agile and just stubble (think Killi). They are normally between 3'-5', generally strong, with a good constitution that comes from being healthy eaters and hearty drinkers. They do have a fondness for gems, gold and valuable objects, and are also naturally good with rocks.

Players Handbook (page 15)

The race of dwarves typically dwells in hilly or mountainous regions. For details of the race in general the reader is referred to ADVANCED DUNGEONS & DRAGONS, MONSTER MANUAL. As player characters, both dwarves and their cousins the "mountain dwarves" can be considered.

House Rule

Even though a dwarf's origin may be anything from mountain to city, all dwarves retain an inherent knowledge of mining and underground landscaping.
Ignore the bit about being non-magical. Dwarves can be magic users, they are just rare.
But they do get the saving throw bonuses for high constitution.
Dwarves like all other races do NOT have infravision or seeing in the dark!

Languages

Dwarves can speak dwarf (their local dialect, and to certain extent other dialects, but not perfectly) and common tongue. They get 1 additional language (generally a humanoid type) if intelligence is 16 or more. And that language knowledge has to have a logical reason for being known. ie they can speak a tongue like kobold, orc or goblin if they have come into frequent association with an existing character who could speak the language. And gnomes don't exist, except as garden ornaments.

Age

Dwarves typically live up to 180-200 years. Some have been known to live to 300-350 but this is very rare. They are normally considered a young adult by the time they have reached their mid 30's.
The reason for this ruling is that there isn't 1000's of years of history in Aerisian, and in reality I don't want to have to write the sort of historical background that Tolkein created over decades of writing. Player characters have grown up enjoying peace amongst the Dwarves, Elves and Humans, and therefore cannot have history that stretches too far back, nor can they have too much life experience. Therefore most player characters regardless of race will be between their 20's-50's.