Short answer

• Several cat-food brands sold in Australia make either "all life stages" (single recipes formulated for kittens through seniors) products or complete ranges that cover every life stage (kitten → adult → senior). Notable examples include Black Hawk, Hill’s (Science Diet), Purina (Pro Plan / Purina ONE / Total Care), Royal Canin and Absolute Holistic. (blackhawkpetcare.com)

Quick details (what each label means)

• "All life stages" product: a single formula that meets nutritional profiles for kittens, adults and seniors (useful for multi-cat households or simple feeding). Example: Black Hawk states some of its cat recipes are formulated to meet AAFCO "all life stages" nutrient profiles. (blackhawkpetcare.com)
• Life-stage ranges: many major brands offer separate formulas tailored to kitten, adult and senior needs (recommended by most vets for optimal growth, maintenance or ageing support). Examples: Hill’s Science Diet, Purina (Pro Plan / related Purina cat lines) and Royal Canin all publish explicit life-stage product lines on their Australian sites. (hillspet.com.au)

Other Australian / regional brands to consider

• Absolute Holistic — markets wet/dry recipes positioned as complete nutrition suitable for all life stages. (adspet.com.au)
• Many supermarket and specialist-brand lines (including some local Australian makers) either label products as "complete and balanced" for specific life stages or as "all life stages" — always check the pack for the nutrition statement and which life stages it covers. (This is a summary inference from the brand pages above.) (petstation.com.au)

How to choose the right option

• Read the packaging: look for "complete and balanced" and whether it says "all life stages" or lists kitten/adult/senior separately.
• Check nutritional standards: reputable brands will say they meet AAFCO (or FEDIAF) nutrient profiles or show a veterinary/nutrition statement.
• Consider life stage and health: most vets recommend feeding age-appropriate formulas (kitten growth, adult maintenance, senior support), but "all life stages" diets can be convenient for mixed-age households or short-term use.
• If your cat has special needs (medical, weight, allergies), use a targeted formula or ask your vet.

If you’d like, I can:

• Check a particular brand or product packaging for the exact life-stage claim, or
• Give a short list of specific "all life stages" products available at Australian retailers right now.