https://wiki.eveuniversity.org/Wormholes

The next sentence indicates how much life the wormhole has before it collapses. Show Info on the wormhole will list one of the following:

This wormhole has not yet begun its natural cycle of decay and should last at least another day
This wormhole is beginning to decay, and probably won't last another day
This wormhole is reaching the end of its natural lifetime
Text Meaning Slang
not yet begun more than 24 hours Fresh
beginning to decay between 4 and 24 hours Fresh
reaching the end less than 4 hours EOL

Mass
The third sentence tells you how much mass has passed through the wormhole.

This wormhole has not yet had its stability significantly disrupted by ships passing through it
This wormhole has had its stability reduced by ships passing through it, but not to a critical degree yet
This wormhole has had its stability critically disrupted by the mass of numerous ships passing through and is on the verge of collapse
Text Meaning Slang
not yet over 50% Fresh
not to a critical degree between 50% and 10% Shrink
stability critically disrupted less than 10% Crit


Ship size
The last sentence tells you the size of ships that are allowed into the enter the wormhole.

Text Meaning
Very large ships can pass through this wormhole All ships except for Titans and supercarriers can pass through this hole
Larger ships can pass through this wormhole Battleships, Orcas, and smaller ships can pass through this hole
Up to medium size ships can pass through this wormhole Unplated Nestors, battlecruisers and smaller ships can pass through this hole
Only the smallest ships can pass through this wormhole Only frigates, destroyers, or specially fit HICs can pass through this hole


Damage type to protect against:
* Guristas (Caldari) -> Kinetic/Thermal
* Angel (Minmatar) -> Explosive
* Blood (Amarr) - EM/Thermal
* Sansha (Amarr) - EM/Thermal
* Serpentis (Gallente) - Kinetic/Thermal
* Khanid (Amarr) - EM/Thermal
* Mordus (Caldari) - Kinetic/Thermal
* Amarr Navy - EM/Thermal
* Caldary Navy - Kinetic/Thermal
* Gallente Navy - Kinetic/Thermal
* Minmatar - ALL (Kinetic/Thermal)
* Thukker - Explosive/Kinetic/Thermal
* Roque Drones - ALL
* Komni - Thermal/Kinetic