To understand the NDIS requirements, it's essential to focus on the core eligibility criteria. Here's a summary based on official information:Key NDIS Requirements:
Age:

You must be under 65 years old when you first apply.1

Residency:

You must be an Australian citizen, a permanent resident, or hold a Protected Special Category Visa.2

Disability Requirements:

You must have a permanent and significant disability that:

Substantially reduces your functional capacity.
Affects your ability to participate in everyday activities.
Requires ongoing support.

Essentially, the disability must have a lasting and substantial impact on your life.

Early Intervention:

The NDIS also provides support for early intervention.3 This is for individuals, particularly children, who have a disability or developmental delay where early support can significantly improve outcomes.4

Important Points:
Permanence:

The NDIS focuses on disabilities that are likely to be permanent, although the level of support needed may change over time.5

Significant Impact:

The disability must have a significant impact on your ability to perform daily activities.6

Individual Assessment:

Eligibility is determined through an individual assessment process.7

Where to get the most accurate information:
The most reliable source is the official NDIS website: ndis.gov.au.
I hope this information is helpful.