Building a long-term portfolio that can weather market storms, generate wealth, and keep things simple doesn't have to be complicated. In fact, sometimes the best results come from doing less — but doing it smarter.

For me, the ideal bulletproof portfolio has a few key ingredients: broad diversification, exposure to global leaders, and a focus on quality businesses that can grow through good times and bad.

With that in mind, here are three ASX ETFs that could be top options to hold in a portfolio for the next 10, 20, or even 30 years. They are as follows:

Betashares Diversified All Growth ETF (ASX: DHHF)

If you want a one-stop solution that does it all, the Betashares Diversified All Growth ETF is hard to beat. It's a fund of funds that gives you instant exposure to over 8,000 companies globally, including big names like Apple (NASDAQ: AAPL) and Microsoft (NASDAQ: MSFT) — all in a single trade.

It holds a blend of ETFs. This means you're getting broad global diversification, access to both developed and developing economies, and a natural tilt toward growth.

It is designed for long-term investors who want a simple, low-cost, growth-focused portfolio. And best of all, it automatically rebalances — so your allocation stays consistent over time without you needing to lift a finger. Betashares recently named it as one to buy.

iShares S&P 500 ETF (ASX: IVV)

If you want exposure to the world's most powerful companies, the iShares S&P 500 ETF is the way to do it. It tracks the S&P 500 — which includes giants like Nvidia (NASDAQ: NVDA), Amazon (NASDAQ: AMZN), and Alphabet (NASDAQ: GOOG) — but also features lesser-talked-about growth leaders like Eli Lilly (NYSE: LLY), Broadcom (NASDAQ: AVGO), and Costco (NASDAQ: COST).

These are companies with serious scale, pricing power, and global reach — many of which dominate their industries and keep delivering quarter after quarter. They've helped the S&P 500 outperform most other markets over the long term, and this ASX ETF gives you a direct line into that performance.

It is also one of the lowest-cost ETFs on the ASX, which means more of your returns stay in your pocket. For long-term growth, it is an essential building block.

Betashares Australian Quality ETF (ASX: AQLT)

For a smart local tilt, Betashares Australian Quality ETF brings something special to the table. Instead of just tracking the big end of town, it filters for Australian companies with high return on equity, stable earnings, and strong balance sheets — essentially, a quality overlay on the ASX.

Yes, it holds familiar names like CSL Ltd (ASX: CSL) and Macquarie Group Ltd (ASX: MQG), but it also includes often-overlooked standouts like ARB Corporation (ASX: ARB), and Pinnacle Investment Management Group Ltd (ASX: PNI). These are companies with strong fundamentals, consistent performance, and long-term growth potential that might not get the spotlight in a standard index fund.

This fund helps you avoid the concentration risk of traditional ASX ETFs by tilting toward fundamentally sound businesses — making it a great complement to the global exposure from the others listed above. Betashares also recently named this one as a potential buy.