**Eternal Validity**: No end date for validity or use.

**Perpetual Agreement**: Contract that remains in effect indefinitely.

**Lifelong Status**: Condition of lasting throughout one's life.

**Ongoing Availability**: Continuous presence without a time limit.

**Timeless Relevance**: Pertaining to enduring significance over time.

**Permanent validity**: Does not have a time limit.

**Indefinite usability**: Can be used indefinitely without expiration.

**Timeless quality**: Remains relevant or usable over time.

**Evergreen status**: Always applicable, regardless of date constraints.

**Continuous effectiveness**: Maintains its function without an expiry period.